记录日程安排脚本
记录日程安排脚本
记录日程安排脚本
这个脚本事实上是2个脚本，用来执行一个简单的日历程序。第一个脚本，addagenda.sh,它可以存储两种事件：可重复发生的、一次性发生的。它允许用户指定天数、周或是年。所有的日期都被合法化后保存了起来，同时在家目录下的.agenda文件中还有一行关于事件的描述信息。第二个脚本中，agenda.sh中核实所有的事件，会显示所有安排对应日期的日程。
我觉得这个脚本非常有用，特别是在记录生日和周年纪念的时候。它真的给我减少了很多麻烦。
代码：
addagenda.sh
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#!/bin/sh
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# addagenda.sh --提醒用户向事件脚本中添加新内容
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agendafile="$HOME/.agenda"
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isDayName()
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{
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# 返回值 0，成功；1，失败
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case $(echo $1 | tr '[[:upper:]]' '[[:lower:]]') in
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sun*|mon*|tue*|wed*|thu*|fri*|sat*) retval=0;;
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*) retval=1;;
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esac
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return $retval
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}
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isMonthName()
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{
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case $(echo $1 | tr '[[:upper:]]' '[[:lower:]]') in
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jan*|feb*|mar*|apr*|may*|jun*) return 0;;
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jul*|aug*|sep*|oct*|nov*|dec*) return 0;;
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*) return 1
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esac
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}
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normalize()
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{
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# 返回的字符串中首字母大写，后续2个小写
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echo -n $1 | cut -c1 | tr '[[:lower:]]' '[[:upper:]]'
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echo $1 | cut -c2-3 | tr '[[:upper:]]' '[[:lower:]]'
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}
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if [ ! -w $HOME ]; then
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echo "$0: cannot write in your home directory($HOME)" >&2
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exit 1
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fi
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echo "Agenda: The Unix Reminder Service"
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echo -n "Date of event(day mon, day month year, or dayname): "
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read word1 word2 word3 junk
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if isDayName $word1; then
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if [ ! -z "$word2" ]; then
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echo "Bad dayname format: just specify the day name by itself." >&2
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exit 1
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fi
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date="$(normalize $word1)"
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else
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if [ -z "$word2" ]; then
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echo "Bad dayname format: unknown day name specified" >&2
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exit 1
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fi
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if [ ! -z "$(echo $word1 | sed 's/[[:digit:]]//g')" ]; then
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echo "Bad date format: please specify day first, by day number" >&2
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exit 1
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fi
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if [ "$word1" -lt 1 -o "$word1" -gt 31 ]; then
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echo "Bad date format: day number can only be in range 1-31" >&2
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exit 1
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fi
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if ! isMonthName $word2; then
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echo "Bad date format: unknown month name specified." >&2
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exit 1
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fi
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word2="$(normalize $word2)"
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if [ -z "$word3" ]; then
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date="$word1$word2"
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else
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if [ ! -z "$(echo $word3 | sed 's/[[:digit:]]//g')" ]; then
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echo "Bad date format: year value should be 2000-2500" >&2
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exit 1
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elif [ $word3 -lt 2000 -o $word3 -gt 2500 ]; then
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echo "Bad date format: year value should be 2000-2500" >&2
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exit 1
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fi
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date="$word1$word2$word3"
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fi
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fi
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echo -n "One-line description: "
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read description
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# Ready to write to data file
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echo "$(echo $date | sed 's/ //g') | $description" >> $agendafile
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exit 0
agenda.sh
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#!/bin/sh
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# agenda.sh --查看.agenda文件中是否有今明两天的安排
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agendafile="$HOME/.agenda"
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checkDate()
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{
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# Create the possible default values that'll match today
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weekday=$1 day=$2 month=$3 year=$4
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format1="$weekday" format2="$day$month" format3="$day$month$year"
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# and step through the file comparing dates...
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IFS="|" # the reads will naturally split at the IFS
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echo "On the Agenda for today:"
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while read data description; do
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if [ "$date" = "$format1" -o "$date" = "$format2" -o "$date" = "$format3" ]; then
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echo "$description"
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fi
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done < $agendafile
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}
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if [ ! -e $agendafile ]; then
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echo "$0: You don't seem to have an .agenda file." >&2
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echo "To remedy this, please use 'addagenda' to add events" >&2
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exit 1
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fi
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# Now let's get today's date...
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eval $(date "+weekday=\"%a\" month=\"%b\" day=\"%e\" year=\"%G\"")
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day="$(echo $day | sed 's/ //g')" # remove possible leading space
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checkDate $weekday $day $month $year
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exit 0
addagenda.sh这个脚本，支持3中类型的事件：每周的(比如每个周三)、每年的(比如8月3号)，以及一次性的(比如2010年1月10号)。而用户提供的日期会被程序压缩，比如用户给的日期是3 August，压缩后变为3Aug，或是Thursday变成了Thu。完成这个功能的代码是如下函数：
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normalize()
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{
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# 返回的字符串中首字母大写，后续2个小写
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echo -n $1 | cut -c1 | tr '[[:lower:]]' '[[:upper:]]'
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echo $1 | cut -c2-3 | tr '[[:upper:]]' '[[:lower:]]'
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}
agenda.sh脚本通过日期来核实事件。并且该脚本会将这个日期转换为3中可能的日期格式(dayname, day+month, day+month+year)。它仅仅是简单的和.agenda文件中的行比较下。如果有匹配，就显示给用户。
在我看来，最牛逼最狂霸酷炫拽的地方是如何应用一个eval表达式一次性的分配4个日期值给变量的：
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eval $(date "+weekday=\"%a\" month=\"%b\" day=\"%e\" year=\"%G\"")
同样，一个接一个提取值也是可以的(比如，weekday="$(date +%a)")，但在有些非常罕见的情况中，这种方法可能会失效：在4个日期请求的中间部分，此时真实日期滚动到了新的一天，因此一个简洁的单一调用更好(注：这个单一的句子就相当于一个原子调用。类似操作系统中的竟态条件)。
运行脚本，测试一下：
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$ addagenda
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Agenda: The Unix Reminder Service
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Date of event (day mon, day month year, or dayname): 31 October
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One line description: Halloween
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$ addagenda
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Agenda: The Unix Reminder Service
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Date of event (day mon, day month year, or dayname): 30 March
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One line description: Penultimate day of March
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$ addagenda
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Agenda: The Unix Reminder Service
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Date of event (day mon, day month year, or dayname): Sunday
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One line description: sleep late (hopefully)
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$ addagenda
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Agenda: The Unix Reminder Service
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Date of event (day mon, day month year, or dayname): marc 30 03
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Bad date format: please specify day first, by day number
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$ addagenda
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Agenda: The Unix Reminder Service
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Date of event (day mon, day month year, or dayname): 30 march 2003
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One line description: IM Marv to see about dinner
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Now the agenda script offers a quick and handy reminder of what's happening today:
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$ agenda
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On the Agenda for today:
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Penultimate day of March
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sleep late (hopefully)
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IM Marv to see about dinner
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Notice that it matched entries formatted as day+month, day of week, and day+month+year. For completeness, here's
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the associated .agenda file, with a few additional entries:
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$ cat ~/.agenda
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14Feb|Valentine's Day
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25Dec|Christmas
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3Aug|Dave's Birthday
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4Jul|Independence Day (USA)
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31Oct|Halloween
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30Mar|Penultimate day of March
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Sun|sleep late (hopefully)
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30Mar2003|IM Marv to see about dinner
这两个脚本在记录日记方面仅仅是起到了一个抛砖引玉的作用。要想搞的更好点，可以在脚本中做一点关于日期的数学运算。另外，如果匹配的日期没有日程安排，可以更人性化的输出一句别的什么内容。
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